Solve 3x − 10 = 38

The solution of 3x − 10 = 38 is x = 16.

3x - 10 = 38\ \Rightarrow\ x = 16

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The lines y = 3x − 10 and y = 38 meet at x = 16. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$3x - 10 = 38$
2
Add 10 to both sides:
$3x - 10 + 10 = 38 + 10 \ \Rightarrow\ 3x = 48$
3
Divide both sides by 3:
$\frac{3x}{3} = \frac{48}{3} \ \Rightarrow\ x = 16$
4
Check: put x = 16 back into the equation.
$3\cdot16 - 10 = 48 - 10 = 38 \checkmark$

LaTeX source of the formulas on this page

\[ 3x - 10 = 38\ \Rightarrow\ x = 16 \]
\[ 3x - 10 = 38 \]
\[ 3x - 10 + 10 = 38 + 10 \ \Rightarrow\ 3x = 48 \]
\[ \frac{3x}{3} = \frac{48}{3} \ \Rightarrow\ x = 16 \]
\[ 3\cdot16 - 10 = 48 - 10 = 38 \checkmark \]

Trying values of x in 3x − 10 = 38

x	3x − 10	Equals 38?
14	32	no
15	35	no
16	38	yes
17	41	no
18	44	no

Questions

What is x in 3x − 10 = 38?

The solution of 3x − 10 = 38 is x = 16.

How do you solve 3x − 10 = 38?

Add 10 to both sides to get 3x = 48, then divide both sides by 3 to get x = 16.

How do I check the answer?

Replace x by 16: 3(16) − 10 = 38, which is 38.

Solve 3x − 10 = 38

How to work it out

Trying values of x in 3x − 10 = 38

Questions

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